<PRE><B>Question 149039</B>
x=speed of one train
x-9=speed of the other train
mph(hr)=total distance


4(x)+4(x-9)=196---------------------------------because the sum of 4 hours times both speeds will give you the total distance


Simplify
4x+4x-36=196


Combine like terms
8x-36=196


Add 36 to each side
8x=232


Divide by 8
x=29


[x=speed of one train]
[x-9=speed of the other train]


speed of one train= 29mph
speed of the other train= 20mph</PRE>